I have a set of them on my 99 suburban. They are noisy on the highway, but wear well. I have 30k on them with about another 10k to go before replacement. I drive about the same 75 city/25 gravel and tow. The ones I have where manufactured by Kelley Springfield Tire Company which is owned by Goodyear. I would buy them again.

TBC/ Multi Mile makes a fine tire but for towing a lot I'd get something with more of a highway center rib.

What does that mean? I'm curious as I never thought about the center rib and towing on the highway.

Something like this:

Every little tread block on your multi-mile tire is going to flex, scrub, and wear when you accellerate/ tow. The continuous center rib will support itself. I just think that knobby tread is a bit extreme for your proposed conditions.